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I can confirm the problem. I use 3 build jobs in parallel
and the kernel build takes 2,5 times longer.
I'm only seeing 1 (of 4) cores are running with max frequency.
The other are running in minimum frequency. And this seems not
to be limited to build jobs however.
The last known good kernel for me is ..-4.8.0-14604-g29fbff8
Jörg